Expandable hone



4 QM. Q\ Mmnfv 2 Q www! 1 NDO u 5 2 mi Q Q \\n\\mw N uw WM M d I www. J @C Y B N Em m1, .EE W.. um 1v. D En E S i J F nln\\\\\\\\\\\xwmm w .mg Y Q E t Dec. 22, 1953 Patented Dec. 22, u1953 Jack F. Smole, Cleveland Heights, and Arthur Collier, Cleveland, Ohio, assignors, 'by mesne assignments, to Lempco Products, Inc., Bedford, Ohio, a corporation of Ohio Application July 17, 1946, Serial No. 684,270

The Ypresent invention relates to adjustable expansion metal working tools, and more particularly to expansible hones.

An object of the present invention is to provide 'anexpansible hone, or a similar metal Working tool, in which the mechanism for effecting the expansion may be formed of relatively few parts, including stampings or die castings, for example, so that the expense of such tools may be greatly reduced below that of previously known tools of this type, and without sacricing the accuracy ofoperation of the tool.

Another object of the invention is to provide an expansible hone of the type employing cam surfaces for' effecting radial movement oi the cutting or honing elements, the construction being such that no machining operations are necessary in the formation of the cams, the cams being formed by a stamping operation or by die castin-g.

Another object ofA the invention is to lprovide for the ready reversal of the camming elements so that the operating characteristics of the hone may be easily' changed bythe user, if desired.

y'Still another object of the invention is to provide in an expansible hone, of the type in which two or more stonecarriers are mounted on a mandrel and are moved longitudinally thereof for causing radial movement of the carriers, the means for positioningV the carriers radially-consisting of an adjustable stop member atone end of thecarriers and a spring pressed member at the opposite end of the carriers for resillently urging the carriers against the adjustable stop member, an equalizer interposed between the carriers and Vone of the members so that equal spring pressure will be applied to each carrier, although the length of the carriers may not be exactly equal.

Other. objects and advantages of the invention will be apparent from the following description, reference being made to the accompanying drawingY wherein: s

Fig. l is a side elevational View of a hone tool embodying my invention;

Fig. 2 is a view similar to that of Fig.u1, but partly in section and drawn to a -large scale;

Fig. 3 is a' view similar to that of Fig. 2 but showing certain Vparts of the tool in different positions;Y Y

Fig. 4 is a View similar to that of Fig. 1 but showing stone carrying members thereof in reversed positions;

Fig. 5 is a, view taken in section on line 5-5 of Fig. 2; and

Fig-6 is a view in section taken one line 6 6 of Fig. 3.

Heretofore adjustable expansion hones -have been provided in which the honing stones were carried by backing members or carriers supported on a mandrel, and these carriers were adjustable radially of the mandrel by means of camming arrangements. Generally, the mandrel has been provided with cam surfaces which were adapted to react on complementarily shaped cam surfaces associated with the stone carriers. These types of mechanisms have required considerable precision machining which necessarily increased the cost of manufacture. By our invention, we propose to eliminate substantially all precision machine work so that the expansion of the hones may be effected by mechanism formed by inexpensive methods and yet which will have the operating accuracy desired.

Referring now to the drawings, we have shown generally at l0 an expansible hone. The hone IU comprises an elongated mandrel Il which is preferably square in cross-section as may be seen in Fig. 5. One end of the mandrel is received in a head l2 and secured therein by a lockscrew I3, the headlZ being threaded for drivingly attaching the mandrel in the spindle of a suitable driving mechanism, not shown, y

The mandrel l l is bored through in four places intermediate its ends, the bores being at right angles to the axis thereof, and four pins l5 are drivingly secured in the bores. The pins I5-are circular, and preferablyV they are of hardened metal. [It is to be understood that more or fewer than four pins may be used, as desired.

A ypair of stone carriers I6, which are channel shaped in cross-section, are adapted to overlie and embrace opposite sides of the mandrel Il, and the channel flanges I1 of the vcarriers are adapted to extend over the surfacesof the mandrel from whichV the pins l5 project. Stones '33 are mounted on the webs of the channels by any of the well known commercial cements suitable for the purpose. The channel anges Il are provided with cam shaped edge portions or cams I8, which are all formed similarly vto one another and which are adapted to engage the respective pins l5 as cam followers. Preferably, the carriers are of sheet metal, formed in the shape shown and described, by a stamping operation, although they could be formed by other methods, such as die casting. The opposite ends of the carriersY IIS are oppositely tapered toward. the axis of the mandrel and at one end the carriers are engaged by a sleeve nally on the mandrel, and yalso :may r-rock :about the diametral edge provided =by the bend. The

washer 2i is resiliently urged against thefcarrier ends by` a collar 25 that is spring lpressed by a compression spring 26 .disposed between collar 25 and an abutment member 27 secured to the mandrel by a screw 28. The surface lof collar 25 engaging the ywasher 2l is planar so that in fthefeventone-of the ,carriers vI 6 eis shorter than the other, due to a discrepancy inzrproduction, for example, the washer will -rock on vits diametral edge to contact -both `sur/faces 23 and and transmit the force -of the spring 25 equally to vthe `respective icar-riers. By 4this arrangement, -the washer 2! serves as Aa force equalizer between the spr-ing 2,6 and the-carriers so that lthe carriers will always be .urged Ainto abuttingrelaf vtion gwith lsurf-aces 20 on -the sleeve i9 andthe longitudinal vposi-tion of the Acarriers will be determi-ned by the position ofsleeve i9. The surfaces 29 4andv2v3 -of the sleeve and washer 2l, respectively, vact as cams and exert radially in- Ward components -`of --force on the ends of the carriers -I to urge -the Vlatter-into engagement With `the pins .vl-5 at all times. The washer 2l, by being 'adaptable to uniformly engage both carrier-salse prevents chatter-of the carriers inasmuch as they will always'be maintained under compression between the-surfaces Zita-nd 2.3 of the. sleeve I9and washer 2|, respectively.

The sleeve i9 is adapted to be --moved longitudinallyjon-the mandrel -i -I byan adjustingcollar 3l), thecollar 3l] being meuntedon a thrnst fbearing -3i so that itmay rotate freely relative tothe mandrel. The adjusting collar is adapted to be moved vlongitudinally -by mechanism associated with the machine that rotates the mandrel, which mechanism and machine do not'form part ofthe invention and are therefore not shown. It will -be seen -that the sleeve i9 is in effect a 'longitudinally movable stop the .pesiticn of which determines .the position of the carriers I6 longitudinally onY the mandrel.

Vllt wil-l now be apparent that when the carriers i6 are lplaced on the mand-rel -as indicated in `lig. l, the work can be .placed over .thelfione and sleeve i9 may then be moved lto the left, to `move `the carriers toward Nthe left and the cams I8 of -the carriers, coactin-g with the pins I5 as cam followers, cause outward radial movemen-t of -the carriers -to cut the wor-k; Iandthat when -thersleeve |79 is `retracted toward theA right, or when the force which moves it is withdrawn, the spring -26 moves the carriers toward thevright, and 4they concurrently move inwardly radially, the carriers being biased at all times to tend t to -move inwardly 4radially and keep 'the cams YI8 in lcontact with the pins I-Ei as described; and the work may then be withdrawn from the hone.

The ucarriers being biased toward positions of minimum diameter of the stones -33 at all times. the expansion of the `stones will be effected-by movement ofthe collar A3i).

If the carriers are put on the mandrel in the reverse positions as shown in Fig. 4, the action of spring 26 will tend to bias the carriers to the right for causing expansion of the hone. It will be evident that by this arrangement the adjusting collar 30 may be moved to the left to contract y.the hone l'and the work Lthen fplaced over the 4hone set for the Tdesiredex-pansion of the hone, and the stones while working and abradling the work, will be resiliently urged by the ,spring 2,6 outwardly to the maximum diameter Tfor which the hone is thus set. The hone will th-us automaticallycut the work to the desired diameter, and fth'en may be Withdrawn.

f lit-will "be-evident from the foregoing that we v`have provided an iextremely simple expansible hone mechanism and one which may be formed by inexpensive operations 'and from a minimum of parts. By forming the carrier I6 by low cost stamping operations or by die casting, it is `economical to Idiscard ithesegcarriers prior' to the time they have worn sufcientlyyto fcause inaccuracy in their use. Also, -it will 'be -observed that the-replacement or reversal of the stones, including the carriers, is 'quite simple, =it

merely bein-g necessary `to retract -collar A22 against the `tension ,of spring 26, thereby permitting they free removal Vand replacement of the carriers i5. Y

Although we have described but one form of the invention, it is `to be lunderstood that other forms might be adopted,A all Yfallingwithin :the scope' of the :claims which follow.

We claim:

l. An Iadjustable hone comprising a Aspindle vof polygonal `cross-section having spaced ypa-irs of oppositely extending fcam surfaces extend-ing from opposite faces thereof; a pair 4of substantially-Ueshap-ed blades straddling opposite-faces of the spindle and having inclined recessesengaging related -cam Vsurfaces of the spindle; stones on the outer faces of the blades adapted to together form an approximately cylindrical honing surface; 'means for maintaining 'the blades 'assembled ,on the spindle whilepermnting `simultaneous .shifting of -the .blades on the spindlelto Vary the effective diameter ofthehoning surfaces of vthe stones; said'spin'dle having a longitudinally disposed series of lholes .extending therethrough intermediate the blades; land coirespondngly shaped blocks forming thecam surfaces ylling saidhol'es and yexten'ding beyond the sides `of the spindle and engaging ,the inclined recesses'of the blades. Y

2. An adjustable. hone comprising aV spindle havingyspaced pairs of oppositely extending cam surfaces extending 'from opposite faces thereof; avl'pair of ysubstantially U-lshaped blades straddlingopposite faces of the spindle and having inclined recesses engaging cam nsurfaces of the spindle; stonesjon the outer faces of the blades adapted to 'together 1form an approximately cylindrical honing surface; Vmeans for maintain-ing the. blades assembled -on fthe spindle while 'permitting simultaneous -shifting vof the blades on-t-he :spindle tovary the effective r-diameter of -thewhoningsurfaces -of thestones; said spindle having a longitudinally disposed series of holes extending laterally Ytherein-intermediate the blades; and means engagedjinjsaid holes and carrying said -oppositely kextended `cam surfaces `fer engaging, :the inclined recesses iof "the blades.

k3. Ahone tool-adapted to 'be` rotatably driven by a machine of the ,type having va movable.

extending longitudinally of the carrier and en" gageable with the said side walls of the projections; whereby when the carrier is moved/longitudinally of the mandrel; the carrier will/be cammingly moved radially of the mandrel," and means for selectively positioning the carrier longitudinally of the mandrel comprising,l means on the mandrel engageable by the said movable adjusit-f l ably positionable element of the machine and correspondingly movable therewith and reacting on the carrier to correspondingly move and position it longitudinally.

4. A honing tool comprising a mandrel substantially rectangular in cross section; an elongated channel shaped abrading stone carrier disposed with its channel iianges overlying opposite sides of the mandrel and its web overlying the side of the mandrel intermediate said opposite sides; a plurality of projections extending from said opposite sides of the mandrel and characterized by circumscribing side walls extending transversely of the mandrel; the edges of said flanges having longitudinally extending cam surfaces formed thereon; the cam vsurfaces being adapted to engage the said side walls of respective projections whereby when the carrier is moved 1ongitudinally it will be moved radially Vof the mandrel by co-action of kthe'cam surfaces and projections; and resilient means reacting on the mandrel and carrier constraining the carrier to move longitudinally in one direction.

5. An adjustable hone comprising a spindle of polygonal cross-section having spaced pairs of oppositely extending cam follower surfaces extending from opposite facesv thereof; la pair of substantially U-shaped blades straddling opposite faces of the spindle and having inclined recesses engageing related cam follower surfaces of the spindle; stones on the outer faces of the blades adapted to together form an approximately cylindrical honing surface; means maintaining the blades assembled on the spindle while permitting simultaneous shifting of the blades on the spindle to vary-the effective diameter of the honing surfaces'of the stones; said spindle having a longitudinally disposed series of holes extending therethrough intermediate the blades; and correspondingly shaped blocks forming the cam followers iilling Asaid holes and extending beyond the sides of the spindle and engageing the inclined recesses of the blades.

6. An adjustable hone comprising a spindle having spaced pairs of oppositely extending cam lfollower surfaces extending from opposite faces thereof; a pair of substantially U-shaped blades straddling opposite faces of the spindle and having inclined recesses engageing cam follower surfaces ofthe spindle; stones on the outer faces of the bladesadapted to together form an approximately cylindrical honing surface; means maintaining the blades assembled onthe spindle while permitting simultaneous shifting of the blades on the spindle to vary the effective diameter of the honing surfaces of the'stones; said spindle having a longitudinally disposed series of holes extending laterally therein intermediate the blades; and means engaged in said holes and carrying said oppositely vextended cam follower surfaces for engageing the inclined recesses of the blades.

JACK F. SMOLEI. ARTHUR COLLIER.

References Cited in the le of this patent UNITED STATES PATENTS 

